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Finding the Fourth Proportional to 1,547.39, 2,135.62 and 987.68

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Solution

The fourth proportional to 1,547.39, 2,135.62 and 987.68 is: 1,363.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.39 : 2,135.62 = 987.68 : x
  2. Step 2: Convert to fraction form
    1,547.39/2,135.62 = 987.68/x
  3. Step 3: Cross multiply
    1,547.39x = 2,135.62 × 987.68
  4. Step 4: Simplify right side
    1,547.39x = 2,109,309.16
  5. Step 5: Solve for x
    x = 2,109,309.16/1,547.39
  6. Step 6: Final answer
    x = 1,363.14

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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.