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Finding the Fourth Proportional to 1,019.76, 1,407.20 and 577.66

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Solution

The fourth proportional to 1,019.76, 1,407.20 and 577.66 is: 797.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.76 : 1,407.20 = 577.66 : x
  2. Step 2: Convert to fraction form
    1,019.76/1,407.20 = 577.66/x
  3. Step 3: Cross multiply
    1,019.76x = 1,407.20 × 577.66
  4. Step 4: Simplify right side
    1,019.76x = 812,877.05
  5. Step 5: Solve for x
    x = 812,877.05/1,019.76
  6. Step 6: Final answer
    x = 797.12

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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.