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Finding the Fourth Proportional to 72,295,737.66, 99,770,978.63 and 40,506,181.47

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Solution

The fourth proportional to 72,295,737.66, 99,770,978.63 and 40,506,181.47 is: 55,900,133.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,295,737.66 : 99,770,978.63 = 40,506,181.47 : x
  2. Step 2: Convert to fraction form
    72,295,737.66/99,770,978.63 = 40,506,181.47/x
  3. Step 3: Cross multiply
    72,295,737.66x = 99,770,978.63 × 40,506,181.47
  4. Step 4: Simplify right side
    72,295,737.66x = 4,041,341,365,826,271.50
  5. Step 5: Solve for x
    x = 4,041,341,365,826,271.50/72,295,737.66
  6. Step 6: Final answer
    x = 55,900,133.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.