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Finding the Fourth Proportional to 390,988.63, 584,057 and 283,519.45

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Solution

The fourth proportional to 390,988.63, 584,057 and 283,519.45 is: 423,520.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,988.63 : 584,057 = 283,519.45 : x
  2. Step 2: Convert to fraction form
    390,988.63/584,057 = 283,519.45/x
  3. Step 3: Cross multiply
    390,988.63x = 584,057 × 283,519.45
  4. Step 4: Simplify right side
    390,988.63x = 165,591,519,408.65
  5. Step 5: Solve for x
    x = 165,591,519,408.65/390,988.63
  6. Step 6: Final answer
    x = 423,520.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.