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Finding the Fourth Proportional to 700.92, 1,045.98 and 615.60

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Solution

The fourth proportional to 700.92, 1,045.98 and 615.60 is: 918.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.92 : 1,045.98 = 615.60 : x
  2. Step 2: Convert to fraction form
    700.92/1,045.98 = 615.60/x
  3. Step 3: Cross multiply
    700.92x = 1,045.98 × 615.60
  4. Step 4: Simplify right side
    700.92x = 643,905.29
  5. Step 5: Solve for x
    x = 643,905.29/700.92
  6. Step 6: Final answer
    x = 918.66

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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.