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Finding the Fourth Proportional to 937.70, 1,294.58 and 643.40

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Solution

The fourth proportional to 937.70, 1,294.58 and 643.40 is: 888.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.70 : 1,294.58 = 643.40 : x
  2. Step 2: Convert to fraction form
    937.70/1,294.58 = 643.40/x
  3. Step 3: Cross multiply
    937.70x = 1,294.58 × 643.40
  4. Step 4: Simplify right side
    937.70x = 832,931.16
  5. Step 5: Solve for x
    x = 832,931.16/937.70
  6. Step 6: Final answer
    x = 888.27

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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.