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Finding the Fourth Proportional to 708.32, 1,058.76 and 615.03

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Solution

The fourth proportional to 708.32, 1,058.76 and 615.03 is: 919.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.32 : 1,058.76 = 615.03 : x
  2. Step 2: Convert to fraction form
    708.32/1,058.76 = 615.03/x
  3. Step 3: Cross multiply
    708.32x = 1,058.76 × 615.03
  4. Step 4: Simplify right side
    708.32x = 651,169.16
  5. Step 5: Solve for x
    x = 651,169.16/708.32
  6. Step 6: Final answer
    x = 919.31

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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.