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Finding the Fourth Proportional to 730.52, 1,007.70 and 643.40

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Solution

The fourth proportional to 730.52, 1,007.70 and 643.40 is: 887.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.52 : 1,007.70 = 643.40 : x
  2. Step 2: Convert to fraction form
    730.52/1,007.70 = 643.40/x
  3. Step 3: Cross multiply
    730.52x = 1,007.70 × 643.40
  4. Step 4: Simplify right side
    730.52x = 648,354.18
  5. Step 5: Solve for x
    x = 648,354.18/730.52
  6. Step 6: Final answer
    x = 887.52

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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.