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Finding the Fourth Proportional to 1,547.40, 2,134.16 and 987.69

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Solution

The fourth proportional to 1,547.40, 2,134.16 and 987.69 is: 1,362.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.40 : 2,134.16 = 987.69 : x
  2. Step 2: Convert to fraction form
    1,547.40/2,134.16 = 987.69/x
  3. Step 3: Cross multiply
    1,547.40x = 2,134.16 × 987.69
  4. Step 4: Simplify right side
    1,547.40x = 2,107,883.55
  5. Step 5: Solve for x
    x = 2,107,883.55/1,547.40
  6. Step 6: Final answer
    x = 1,362.21

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1.5x scale

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.