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Finding the Fourth Proportional to 956.40, 1,320.12 and 607.20

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Solution

The fourth proportional to 956.40, 1,320.12 and 607.20 is: 838.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.40 : 1,320.12 = 607.20 : x
  2. Step 2: Convert to fraction form
    956.40/1,320.12 = 607.20/x
  3. Step 3: Cross multiply
    956.40x = 1,320.12 × 607.20
  4. Step 4: Simplify right side
    956.40x = 801,576.86
  5. Step 5: Solve for x
    x = 801,576.86/956.40
  6. Step 6: Final answer
    x = 838.12

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Half scale
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Double scale
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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.