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Finding the Fourth Proportional to 290,381.86, 435,557.28 and 90,679.39

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Solution

The fourth proportional to 290,381.86, 435,557.28 and 90,679.39 is: 136,014.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,381.86 : 435,557.28 = 90,679.39 : x
  2. Step 2: Convert to fraction form
    290,381.86/435,557.28 = 90,679.39/x
  3. Step 3: Cross multiply
    290,381.86x = 435,557.28 × 90,679.39
  4. Step 4: Simplify right side
    290,381.86x = 39,496,068,460.46
  5. Step 5: Solve for x
    x = 39,496,068,460.46/290,381.86
  6. Step 6: Final answer
    x = 136,014.24

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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.