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Finding the Fourth Proportional to 1,275.70, 1,913.55 and 886.90

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Solution

The fourth proportional to 1,275.70, 1,913.55 and 886.90 is: 1,330.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.70 : 1,913.55 = 886.90 : x
  2. Step 2: Convert to fraction form
    1,275.70/1,913.55 = 886.90/x
  3. Step 3: Cross multiply
    1,275.70x = 1,913.55 × 886.90
  4. Step 4: Simplify right side
    1,275.70x = 1,697,127.50
  5. Step 5: Solve for x
    x = 1,697,127.50/1,275.70
  6. Step 6: Final answer
    x = 1,330.35

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Similar ratio
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1.5x scale

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.