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Finding the Fourth Proportional to 85,657,762.85, 128,486,644.28 and 45,346,978.85

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Solution

The fourth proportional to 85,657,762.85, 128,486,644.28 and 45,346,978.85 is: 68,020,468.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,657,762.85 : 128,486,644.28 = 45,346,978.85 : x
  2. Step 2: Convert to fraction form
    85,657,762.85/128,486,644.28 = 45,346,978.85/x
  3. Step 3: Cross multiply
    85,657,762.85x = 128,486,644.28 × 45,346,978.85
  4. Step 4: Simplify right side
    85,657,762.85x = 5,826,481,140,445,899
  5. Step 5: Solve for x
    x = 5,826,481,140,445,899/85,657,762.85
  6. Step 6: Final answer
    x = 68,020,468.28

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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.