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Finding the Fourth Proportional to 78,312,012.80, 117,468,019.20 and 78,312,012.80

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Solution

The fourth proportional to 78,312,012.80, 117,468,019.20 and 78,312,012.80 is: 117,468,019.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,312,012.80 : 117,468,019.20 = 78,312,012.80 : x
  2. Step 2: Convert to fraction form
    78,312,012.80/117,468,019.20 = 78,312,012.80/x
  3. Step 3: Cross multiply
    78,312,012.80x = 117,468,019.20 × 78,312,012.80
  4. Step 4: Simplify right side
    78,312,012.80x = 9,199,157,023,181,046
  5. Step 5: Solve for x
    x = 9,199,157,023,181,046/78,312,012.80
  6. Step 6: Final answer
    x = 117,468,019.20

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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.