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Finding the Fourth Proportional to 630.40, 938.88 and 607.72

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Solution

The fourth proportional to 630.40, 938.88 and 607.72 is: 905.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.40 : 938.88 = 607.72 : x
  2. Step 2: Convert to fraction form
    630.40/938.88 = 607.72/x
  3. Step 3: Cross multiply
    630.40x = 938.88 × 607.72
  4. Step 4: Simplify right side
    630.40x = 570,576.15
  5. Step 5: Solve for x
    x = 570,576.15/630.40
  6. Step 6: Final answer
    x = 905.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.