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Finding the Fourth Proportional to 72,717,865.60, 109,076,798.40 and 45,508,086.40

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Solution

The fourth proportional to 72,717,865.60, 109,076,798.40 and 45,508,086.40 is: 68,262,129.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,717,865.60 : 109,076,798.40 = 45,508,086.40 : x
  2. Step 2: Convert to fraction form
    72,717,865.60/109,076,798.40 = 45,508,086.40/x
  3. Step 3: Cross multiply
    72,717,865.60x = 109,076,798.40 × 45,508,086.40
  4. Step 4: Simplify right side
    72,717,865.60x = 4,963,876,365,822,582
  5. Step 5: Solve for x
    x = 4,963,876,365,822,582/72,717,865.60
  6. Step 6: Final answer
    x = 68,262,129.60

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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.