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Finding the Fourth Proportional to 390,843.20, 586,264.80 and 388,510.40

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Solution

The fourth proportional to 390,843.20, 586,264.80 and 388,510.40 is: 582,765.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,843.20 : 586,264.80 = 388,510.40 : x
  2. Step 2: Convert to fraction form
    390,843.20/586,264.80 = 388,510.40/x
  3. Step 3: Cross multiply
    390,843.20x = 586,264.80 × 388,510.40
  4. Step 4: Simplify right side
    390,843.20x = 227,769,971,953.92
  5. Step 5: Solve for x
    x = 227,769,971,953.92/390,843.20
  6. Step 6: Final answer
    x = 582,765.60

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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.