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Finding the Fourth Proportional to 290,310,575.80, 435,465,863.70 and 85,820,438.20

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Solution

The fourth proportional to 290,310,575.80, 435,465,863.70 and 85,820,438.20 is: 128,730,657.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,310,575.80 : 435,465,863.70 = 85,820,438.20 : x
  2. Step 2: Convert to fraction form
    290,310,575.80/435,465,863.70 = 85,820,438.20/x
  3. Step 3: Cross multiply
    290,310,575.80x = 435,465,863.70 × 85,820,438.20
  4. Step 4: Simplify right side
    290,310,575.80x = 37,371,871,243,875,472
  5. Step 5: Solve for x
    x = 37,371,871,243,875,472/290,310,575.80
  6. Step 6: Final answer
    x = 128,730,657.30

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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.