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Finding the Fourth Proportional to 390,864.48, 539,392.08 and 212,016.48

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Solution

The fourth proportional to 390,864.48, 539,392.08 and 212,016.48 is: 292,582.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,864.48 : 539,392.08 = 212,016.48 : x
  2. Step 2: Convert to fraction form
    390,864.48/539,392.08 = 212,016.48/x
  3. Step 3: Cross multiply
    390,864.48x = 539,392.08 × 212,016.48
  4. Step 4: Simplify right side
    390,864.48x = 114,360,010,141.48
  5. Step 5: Solve for x
    x = 114,360,010,141.48/390,864.48
  6. Step 6: Final answer
    x = 292,582.25

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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.