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Finding the Fourth Proportional to 145,365.80, 218,145.90 and 66,439.40

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Solution

The fourth proportional to 145,365.80, 218,145.90 and 66,439.40 is: 99,703.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,365.80 : 218,145.90 = 66,439.40 : x
  2. Step 2: Convert to fraction form
    145,365.80/218,145.90 = 66,439.40/x
  3. Step 3: Cross multiply
    145,365.80x = 218,145.90 × 66,439.40
  4. Step 4: Simplify right side
    145,365.80x = 14,493,482,708.46
  5. Step 5: Solve for x
    x = 14,493,482,708.46/145,365.80
  6. Step 6: Final answer
    x = 99,703.53

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1.5x scale

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.