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Finding the Fourth Proportional to 42,807.40, 64,211.10 and 21,812.20

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Solution

The fourth proportional to 42,807.40, 64,211.10 and 21,812.20 is: 32,718.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,807.40 : 64,211.10 = 21,812.20 : x
  2. Step 2: Convert to fraction form
    42,807.40/64,211.10 = 21,812.20/x
  3. Step 3: Cross multiply
    42,807.40x = 64,211.10 × 21,812.20
  4. Step 4: Simplify right side
    42,807.40x = 1,400,585,355.42
  5. Step 5: Solve for x
    x = 1,400,585,355.42/42,807.40
  6. Step 6: Final answer
    x = 32,718.30

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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.