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Finding the Fourth Proportional to 873.71, 1,205.75 and 480.76

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Solution

The fourth proportional to 873.71, 1,205.75 and 480.76 is: 663.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.71 : 1,205.75 = 480.76 : x
  2. Step 2: Convert to fraction form
    873.71/1,205.75 = 480.76/x
  3. Step 3: Cross multiply
    873.71x = 1,205.75 × 480.76
  4. Step 4: Simplify right side
    873.71x = 579,676.37
  5. Step 5: Solve for x
    x = 579,676.37/873.71
  6. Step 6: Final answer
    x = 663.47

Related Problems

Find fourth proportional to 436.86, 602.88 and 240.38
Half scale
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Double scale
Find fourth proportional to 874.71, 1,207.13 and 481.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.