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Finding the Fourth Proportional to 1,129.95, 1,695.59 and 545.55

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Solution

The fourth proportional to 1,129.95, 1,695.59 and 545.55 is: 818.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.95 : 1,695.59 = 545.55 : x
  2. Step 2: Convert to fraction form
    1,129.95/1,695.59 = 545.55/x
  3. Step 3: Cross multiply
    1,129.95x = 1,695.59 × 545.55
  4. Step 4: Simplify right side
    1,129.95x = 925,032.01
  5. Step 5: Solve for x
    x = 925,032.01/1,129.95
  6. Step 6: Final answer
    x = 818.65

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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.