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Finding the Fourth Proportional to 66,281.60, 91,456.01 and 39,430.91

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Solution

The fourth proportional to 66,281.60, 91,456.01 and 39,430.91 is: 54,407.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,281.60 : 91,456.01 = 39,430.91 : x
  2. Step 2: Convert to fraction form
    66,281.60/91,456.01 = 39,430.91/x
  3. Step 3: Cross multiply
    66,281.60x = 91,456.01 × 39,430.91
  4. Step 4: Simplify right side
    66,281.60x = 3,606,193,699.27
  5. Step 5: Solve for x
    x = 3,606,193,699.27/66,281.60
  6. Step 6: Final answer
    x = 54,407.16

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1.5x scale

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.