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Finding the Fourth Proportional to 1,031.60, 1,423.58 and 681.68

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Solution

The fourth proportional to 1,031.60, 1,423.58 and 681.68 is: 940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.60 : 1,423.58 = 681.68 : x
  2. Step 2: Convert to fraction form
    1,031.60/1,423.58 = 681.68/x
  3. Step 3: Cross multiply
    1,031.60x = 1,423.58 × 681.68
  4. Step 4: Simplify right side
    1,031.60x = 970,426.01
  5. Step 5: Solve for x
    x = 970,426.01/1,031.60
  6. Step 6: Final answer
    x = 940.70

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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.