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Finding the Fourth Proportional to 1,387.95, 1,915.65 and 883.47

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Solution

The fourth proportional to 1,387.95, 1,915.65 and 883.47 is: 1,219.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.95 : 1,915.65 = 883.47 : x
  2. Step 2: Convert to fraction form
    1,387.95/1,915.65 = 883.47/x
  3. Step 3: Cross multiply
    1,387.95x = 1,915.65 × 883.47
  4. Step 4: Simplify right side
    1,387.95x = 1,692,426.49
  5. Step 5: Solve for x
    x = 1,692,426.49/1,387.95
  6. Step 6: Final answer
    x = 1,219.37

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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.