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Finding the Fourth Proportional to 1,070.72, 1,606.62 and 763.46

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Solution

The fourth proportional to 1,070.72, 1,606.62 and 763.46 is: 1,145.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.72 : 1,606.62 = 763.46 : x
  2. Step 2: Convert to fraction form
    1,070.72/1,606.62 = 763.46/x
  3. Step 3: Cross multiply
    1,070.72x = 1,606.62 × 763.46
  4. Step 4: Simplify right side
    1,070.72x = 1,226,590.11
  5. Step 5: Solve for x
    x = 1,226,590.11/1,070.72
  6. Step 6: Final answer
    x = 1,145.58

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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.