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Finding the Fourth Proportional to 654.76, 903.80 and 445.20

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Solution

The fourth proportional to 654.76, 903.80 and 445.20 is: 614.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.76 : 903.80 = 445.20 : x
  2. Step 2: Convert to fraction form
    654.76/903.80 = 445.20/x
  3. Step 3: Cross multiply
    654.76x = 903.80 × 445.20
  4. Step 4: Simplify right side
    654.76x = 402,371.76
  5. Step 5: Solve for x
    x = 402,371.76/654.76
  6. Step 6: Final answer
    x = 614.53

Related Problems

Find fourth proportional to 327.38, 451.90 and 222.60
Half scale
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Double scale
Find fourth proportional to 655.76, 905.18 and 446.20
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.