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Finding the Fourth Proportional to 61,430.40, 84,720.96 and 47,980.80

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Solution

The fourth proportional to 61,430.40, 84,720.96 and 47,980.80 is: 66,172.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,430.40 : 84,720.96 = 47,980.80 : x
  2. Step 2: Convert to fraction form
    61,430.40/84,720.96 = 47,980.80/x
  3. Step 3: Cross multiply
    61,430.40x = 84,720.96 × 47,980.80
  4. Step 4: Simplify right side
    61,430.40x = 4,064,979,437.57
  5. Step 5: Solve for x
    x = 4,064,979,437.57/61,430.40
  6. Step 6: Final answer
    x = 66,172.11

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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.