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Finding the Fourth Proportional to 830.13, 1,145.45 and 480.75

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Solution

The fourth proportional to 830.13, 1,145.45 and 480.75 is: 663.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.13 : 1,145.45 = 480.75 : x
  2. Step 2: Convert to fraction form
    830.13/1,145.45 = 480.75/x
  3. Step 3: Cross multiply
    830.13x = 1,145.45 × 480.75
  4. Step 4: Simplify right side
    830.13x = 550,672.68
  5. Step 5: Solve for x
    x = 550,672.68/830.13
  6. Step 6: Final answer
    x = 663.36

Related Problems

Find fourth proportional to 415.07, 572.72 and 240.38
Half scale
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Double scale
Find fourth proportional to 831.13, 1,146.82 and 481.75
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.