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Finding the Fourth Proportional to 1,777.79, 2,666.70 and 545.20

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Solution

The fourth proportional to 1,777.79, 2,666.70 and 545.20 is: 817.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.79 : 2,666.70 = 545.20 : x
  2. Step 2: Convert to fraction form
    1,777.79/2,666.70 = 545.20/x
  3. Step 3: Cross multiply
    1,777.79x = 2,666.70 × 545.20
  4. Step 4: Simplify right side
    1,777.79x = 1,453,878.17
  5. Step 5: Solve for x
    x = 1,453,878.17/1,777.79
  6. Step 6: Final answer
    x = 817.80

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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.