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Finding the Fourth Proportional to 988.74, 1,482.57 and 642.06

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Solution

The fourth proportional to 988.74, 1,482.57 and 642.06 is: 962.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.74 : 1,482.57 = 642.06 : x
  2. Step 2: Convert to fraction form
    988.74/1,482.57 = 642.06/x
  3. Step 3: Cross multiply
    988.74x = 1,482.57 × 642.06
  4. Step 4: Simplify right side
    988.74x = 951,898.89
  5. Step 5: Solve for x
    x = 951,898.89/988.74
  6. Step 6: Final answer
    x = 962.74

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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.