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Finding the Fourth Proportional to 45,783.40, 68,718.30 and 28,287.40

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Solution

The fourth proportional to 45,783.40, 68,718.30 and 28,287.40 is: 42,457.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,783.40 : 68,718.30 = 28,287.40 : x
  2. Step 2: Convert to fraction form
    45,783.40/68,718.30 = 28,287.40/x
  3. Step 3: Cross multiply
    45,783.40x = 68,718.30 × 28,287.40
  4. Step 4: Simplify right side
    45,783.40x = 1,943,862,039.42
  5. Step 5: Solve for x
    x = 1,943,862,039.42/45,783.40
  6. Step 6: Final answer
    x = 42,457.79

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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.