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Finding the Fourth Proportional to 145,431.40, 218,147.10 and 66,699.40

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Solution

The fourth proportional to 145,431.40, 218,147.10 and 66,699.40 is: 100,049.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,431.40 : 218,147.10 = 66,699.40 : x
  2. Step 2: Convert to fraction form
    145,431.40/218,147.10 = 66,699.40/x
  3. Step 3: Cross multiply
    145,431.40x = 218,147.10 × 66,699.40
  4. Step 4: Simplify right side
    145,431.40x = 14,550,280,681.74
  5. Step 5: Solve for x
    x = 14,550,280,681.74/145,431.40
  6. Step 6: Final answer
    x = 100,049.10

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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.