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Finding the Fourth Proportional to 987.64, 1,362.78 and 614.68

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Solution

The fourth proportional to 987.64, 1,362.78 and 614.68 is: 848.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.64 : 1,362.78 = 614.68 : x
  2. Step 2: Convert to fraction form
    987.64/1,362.78 = 614.68/x
  3. Step 3: Cross multiply
    987.64x = 1,362.78 × 614.68
  4. Step 4: Simplify right side
    987.64x = 837,673.61
  5. Step 5: Solve for x
    x = 837,673.61/987.64
  6. Step 6: Final answer
    x = 848.16

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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.