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Finding the Fourth Proportional to 987.50, 1,479.36 and 657.56

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Solution

The fourth proportional to 987.50, 1,479.36 and 657.56 is: 985.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.50 : 1,479.36 = 657.56 : x
  2. Step 2: Convert to fraction form
    987.50/1,479.36 = 657.56/x
  3. Step 3: Cross multiply
    987.50x = 1,479.36 × 657.56
  4. Step 4: Simplify right side
    987.50x = 972,767.96
  5. Step 5: Solve for x
    x = 972,767.96/987.50
  6. Step 6: Final answer
    x = 985.08

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1.5x scale

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.