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Finding the Fourth Proportional to 66,412.60, 99,618.90 and 31,420.60

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Solution

The fourth proportional to 66,412.60, 99,618.90 and 31,420.60 is: 47,130.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,412.60 : 99,618.90 = 31,420.60 : x
  2. Step 2: Convert to fraction form
    66,412.60/99,618.90 = 31,420.60/x
  3. Step 3: Cross multiply
    66,412.60x = 99,618.90 × 31,420.60
  4. Step 4: Simplify right side
    66,412.60x = 3,130,085,609.34
  5. Step 5: Solve for x
    x = 3,130,085,609.34/66,412.60
  6. Step 6: Final answer
    x = 47,130.90

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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.