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Finding the Fourth Proportional to 708.88, 1,057.40 and 621.40

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Solution

The fourth proportional to 708.88, 1,057.40 and 621.40 is: 926.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.88 : 1,057.40 = 621.40 : x
  2. Step 2: Convert to fraction form
    708.88/1,057.40 = 621.40/x
  3. Step 3: Cross multiply
    708.88x = 1,057.40 × 621.40
  4. Step 4: Simplify right side
    708.88x = 657,068.36
  5. Step 5: Solve for x
    x = 657,068.36/708.88
  6. Step 6: Final answer
    x = 926.91

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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.