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Finding the Fourth Proportional to 1,417.96, 2,124.78 and 987.04

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Solution

The fourth proportional to 1,417.96, 2,124.78 and 987.04 is: 1,479.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.96 : 2,124.78 = 987.04 : x
  2. Step 2: Convert to fraction form
    1,417.96/2,124.78 = 987.04/x
  3. Step 3: Cross multiply
    1,417.96x = 2,124.78 × 987.04
  4. Step 4: Simplify right side
    1,417.96x = 2,097,242.85
  5. Step 5: Solve for x
    x = 2,097,242.85/1,417.96
  6. Step 6: Final answer
    x = 1,479.06

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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.