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Finding the Fourth Proportional to 390,501.43, 585,083.49 and 213,132.89

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Solution

The fourth proportional to 390,501.43, 585,083.49 and 213,132.89 is: 319,334.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,501.43 : 585,083.49 = 213,132.89 : x
  2. Step 2: Convert to fraction form
    390,501.43/585,083.49 = 213,132.89/x
  3. Step 3: Cross multiply
    390,501.43x = 585,083.49 × 213,132.89
  4. Step 4: Simplify right side
    390,501.43x = 124,700,535,778.45
  5. Step 5: Solve for x
    x = 124,700,535,778.45/390,501.43
  6. Step 6: Final answer
    x = 319,334.39

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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.