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Finding the Fourth Proportional to 875.40, 1,312.22 and 615.40

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Solution

The fourth proportional to 875.40, 1,312.22 and 615.40 is: 922.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.40 : 1,312.22 = 615.40 : x
  2. Step 2: Convert to fraction form
    875.40/1,312.22 = 615.40/x
  3. Step 3: Cross multiply
    875.40x = 1,312.22 × 615.40
  4. Step 4: Simplify right side
    875.40x = 807,540.19
  5. Step 5: Solve for x
    x = 807,540.19/875.40
  6. Step 6: Final answer
    x = 922.48

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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.