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Finding the Fourth Proportional to 968.79, 1,337.48 and 638.18

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Solution

The fourth proportional to 968.79, 1,337.48 and 638.18 is: 881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.79 : 1,337.48 = 638.18 : x
  2. Step 2: Convert to fraction form
    968.79/1,337.48 = 638.18/x
  3. Step 3: Cross multiply
    968.79x = 1,337.48 × 638.18
  4. Step 4: Simplify right side
    968.79x = 853,552.99
  5. Step 5: Solve for x
    x = 853,552.99/968.79
  6. Step 6: Final answer
    x = 881.05

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Double scale
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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.