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Finding the Fourth Proportional to 521.55, 783.90 and 430.83

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Solution

The fourth proportional to 521.55, 783.90 and 430.83 is: 647.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.55 : 783.90 = 430.83 : x
  2. Step 2: Convert to fraction form
    521.55/783.90 = 430.83/x
  3. Step 3: Cross multiply
    521.55x = 783.90 × 430.83
  4. Step 4: Simplify right side
    521.55x = 337,727.64
  5. Step 5: Solve for x
    x = 337,727.64/521.55
  6. Step 6: Final answer
    x = 647.55

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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.