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Finding the Fourth Proportional to 807.70, 1,114.65 and 512.90

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Solution

The fourth proportional to 807.70, 1,114.65 and 512.90 is: 707.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.70 : 1,114.65 = 512.90 : x
  2. Step 2: Convert to fraction form
    807.70/1,114.65 = 512.90/x
  3. Step 3: Cross multiply
    807.70x = 1,114.65 × 512.90
  4. Step 4: Simplify right side
    807.70x = 571,703.99
  5. Step 5: Solve for x
    x = 571,703.99/807.70
  6. Step 6: Final answer
    x = 707.82

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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.