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Finding the Fourth Proportional to 750.40, 1,035.45 and 418.77

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Solution

The fourth proportional to 750.40, 1,035.45 and 418.77 is: 577.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.40 : 1,035.45 = 418.77 : x
  2. Step 2: Convert to fraction form
    750.40/1,035.45 = 418.77/x
  3. Step 3: Cross multiply
    750.40x = 1,035.45 × 418.77
  4. Step 4: Simplify right side
    750.40x = 433,615.40
  5. Step 5: Solve for x
    x = 433,615.40/750.40
  6. Step 6: Final answer
    x = 577.85

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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.