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Finding the Fourth Proportional to 390,612.80, 584,536.80 and 266,196.80

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Solution

The fourth proportional to 390,612.80, 584,536.80 and 266,196.80 is: 398,353.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,612.80 : 584,536.80 = 266,196.80 : x
  2. Step 2: Convert to fraction form
    390,612.80/584,536.80 = 266,196.80/x
  3. Step 3: Cross multiply
    390,612.80x = 584,536.80 × 266,196.80
  4. Step 4: Simplify right side
    390,612.80x = 155,601,825,642.24
  5. Step 5: Solve for x
    x = 155,601,825,642.24/390,612.80
  6. Step 6: Final answer
    x = 398,353.12

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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.