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Finding the Fourth Proportional to 1,575.85, 2,176.05 and 987.40

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Solution

The fourth proportional to 1,575.85, 2,176.05 and 987.40 is: 1,363.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,575.85 : 2,176.05 = 987.40 : x
  2. Step 2: Convert to fraction form
    1,575.85/2,176.05 = 987.40/x
  3. Step 3: Cross multiply
    1,575.85x = 2,176.05 × 987.40
  4. Step 4: Simplify right side
    1,575.85x = 2,148,631.77
  5. Step 5: Solve for x
    x = 2,148,631.77/1,575.85
  6. Step 6: Final answer
    x = 1,363.47

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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.