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Finding the Fourth Proportional to 1,913.63, 2,870.84 and 615.20

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Solution

The fourth proportional to 1,913.63, 2,870.84 and 615.20 is: 922.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.63 : 2,870.84 = 615.20 : x
  2. Step 2: Convert to fraction form
    1,913.63/2,870.84 = 615.20/x
  3. Step 3: Cross multiply
    1,913.63x = 2,870.84 × 615.20
  4. Step 4: Simplify right side
    1,913.63x = 1,766,127.95
  5. Step 5: Solve for x
    x = 1,766,127.95/1,913.63
  6. Step 6: Final answer
    x = 922.92

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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.