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Finding the Fourth Proportional to 72,155.90, 99,510.67 and 45,300.91

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Solution

The fourth proportional to 72,155.90, 99,510.67 and 45,300.91 is: 62,474.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,155.90 : 99,510.67 = 45,300.91 : x
  2. Step 2: Convert to fraction form
    72,155.90/99,510.67 = 45,300.91/x
  3. Step 3: Cross multiply
    72,155.90x = 99,510.67 × 45,300.91
  4. Step 4: Simplify right side
    72,155.90x = 4,507,923,905.71
  5. Step 5: Solve for x
    x = 4,507,923,905.71/72,155.90
  6. Step 6: Final answer
    x = 62,474.78

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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.