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Finding the Fourth Proportional to 390,609.60, 539,081.45 and 237,658.65

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Solution

The fourth proportional to 390,609.60, 539,081.45 and 237,658.65 is: 327,993.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,609.60 : 539,081.45 = 237,658.65 : x
  2. Step 2: Convert to fraction form
    390,609.60/539,081.45 = 237,658.65/x
  3. Step 3: Cross multiply
    390,609.60x = 539,081.45 × 237,658.65
  4. Step 4: Simplify right side
    390,609.60x = 128,117,369,647.04
  5. Step 5: Solve for x
    x = 128,117,369,647.04/390,609.60
  6. Step 6: Final answer
    x = 327,993.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.