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Finding the Fourth Proportional to 99,457.20, 137,300.40 and 65,487.60

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Solution

The fourth proportional to 99,457.20, 137,300.40 and 65,487.60 is: 90,405.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,457.20 : 137,300.40 = 65,487.60 : x
  2. Step 2: Convert to fraction form
    99,457.20/137,300.40 = 65,487.60/x
  3. Step 3: Cross multiply
    99,457.20x = 137,300.40 × 65,487.60
  4. Step 4: Simplify right side
    99,457.20x = 8,991,473,675.04
  5. Step 5: Solve for x
    x = 8,991,473,675.04/99,457.20
  6. Step 6: Final answer
    x = 90,405.46

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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.