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Finding the Fourth Proportional to 78,009,643.80, 117,014,465.70 and 39,745,891.80

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Solution

The fourth proportional to 78,009,643.80, 117,014,465.70 and 39,745,891.80 is: 59,618,837.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,009,643.80 : 117,014,465.70 = 39,745,891.80 : x
  2. Step 2: Convert to fraction form
    78,009,643.80/117,014,465.70 = 39,745,891.80/x
  3. Step 3: Cross multiply
    78,009,643.80x = 117,014,465.70 × 39,745,891.80
  4. Step 4: Simplify right side
    78,009,643.80x = 4,650,844,292,747,011
  5. Step 5: Solve for x
    x = 4,650,844,292,747,011/78,009,643.80
  6. Step 6: Final answer
    x = 59,618,837.70

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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.