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Finding the Fourth Proportional to 78,762,205.80, 118,143,308.70 and 21,254,384.70

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Solution

The fourth proportional to 78,762,205.80, 118,143,308.70 and 21,254,384.70 is: 31,881,577.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,762,205.80 : 118,143,308.70 = 21,254,384.70 : x
  2. Step 2: Convert to fraction form
    78,762,205.80/118,143,308.70 = 21,254,384.70/x
  3. Step 3: Cross multiply
    78,762,205.80x = 118,143,308.70 × 21,254,384.70
  4. Step 4: Simplify right side
    78,762,205.80x = 2,511,063,332,840,657
  5. Step 5: Solve for x
    x = 2,511,063,332,840,657/78,762,205.80
  6. Step 6: Final answer
    x = 31,881,577.05

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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.