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Finding the Fourth Proportional to 64,280.80, 96,421.20 and 45,618.40

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Solution

The fourth proportional to 64,280.80, 96,421.20 and 45,618.40 is: 68,427.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,280.80 : 96,421.20 = 45,618.40 : x
  2. Step 2: Convert to fraction form
    64,280.80/96,421.20 = 45,618.40/x
  3. Step 3: Cross multiply
    64,280.80x = 96,421.20 × 45,618.40
  4. Step 4: Simplify right side
    64,280.80x = 4,398,580,870.08
  5. Step 5: Solve for x
    x = 4,398,580,870.08/64,280.80
  6. Step 6: Final answer
    x = 68,427.60

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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.