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Finding the Fourth Proportional to 72,012.80, 99,430.80 and 43,756.40

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Solution

The fourth proportional to 72,012.80, 99,430.80 and 43,756.40 is: 60,416.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,012.80 : 99,430.80 = 43,756.40 : x
  2. Step 2: Convert to fraction form
    72,012.80/99,430.80 = 43,756.40/x
  3. Step 3: Cross multiply
    72,012.80x = 99,430.80 × 43,756.40
  4. Step 4: Simplify right side
    72,012.80x = 4,350,733,857.12
  5. Step 5: Solve for x
    x = 4,350,733,857.12/72,012.80
  6. Step 6: Final answer
    x = 60,416.12

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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.