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Finding the Fourth Proportional to 1,657.50, 2,487.40 and 631.50

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Solution

The fourth proportional to 1,657.50, 2,487.40 and 631.50 is: 947.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,657.50 : 2,487.40 = 631.50 : x
  2. Step 2: Convert to fraction form
    1,657.50/2,487.40 = 631.50/x
  3. Step 3: Cross multiply
    1,657.50x = 2,487.40 × 631.50
  4. Step 4: Simplify right side
    1,657.50x = 1,570,793.10
  5. Step 5: Solve for x
    x = 1,570,793.10/1,657.50
  6. Step 6: Final answer
    x = 947.69

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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.