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Finding the Fourth Proportional to 1,547.55, 2,135.96 and 987.91

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Solution

The fourth proportional to 1,547.55, 2,135.96 and 987.91 is: 1,363.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.55 : 2,135.96 = 987.91 : x
  2. Step 2: Convert to fraction form
    1,547.55/2,135.96 = 987.91/x
  3. Step 3: Cross multiply
    1,547.55x = 2,135.96 × 987.91
  4. Step 4: Simplify right side
    1,547.55x = 2,110,136.24
  5. Step 5: Solve for x
    x = 2,110,136.24/1,547.55
  6. Step 6: Final answer
    x = 1,363.53

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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.