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Finding the Fourth Proportional to 390,061.65, 547,660.95 and 390,061.65

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Solution

The fourth proportional to 390,061.65, 547,660.95 and 390,061.65 is: 547,660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,061.65 : 547,660.95 = 390,061.65 : x
  2. Step 2: Convert to fraction form
    390,061.65/547,660.95 = 390,061.65/x
  3. Step 3: Cross multiply
    390,061.65x = 547,660.95 × 390,061.65
  4. Step 4: Simplify right side
    390,061.65x = 213,621,533,797.57
  5. Step 5: Solve for x
    x = 213,621,533,797.57/390,061.65
  6. Step 6: Final answer
    x = 547,660.95

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.