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Finding the Fourth Proportional to 870.48, 1,303.38 and 458.76

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Solution

The fourth proportional to 870.48, 1,303.38 and 458.76 is: 686.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.48 : 1,303.38 = 458.76 : x
  2. Step 2: Convert to fraction form
    870.48/1,303.38 = 458.76/x
  3. Step 3: Cross multiply
    870.48x = 1,303.38 × 458.76
  4. Step 4: Simplify right side
    870.48x = 597,938.61
  5. Step 5: Solve for x
    x = 597,938.61/870.48
  6. Step 6: Final answer
    x = 686.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.