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Finding the Fourth Proportional to 390,061.40, 585,111.30 and 203,437.40

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Solution

The fourth proportional to 390,061.40, 585,111.30 and 203,437.40 is: 305,166.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,061.40 : 585,111.30 = 203,437.40 : x
  2. Step 2: Convert to fraction form
    390,061.40/585,111.30 = 203,437.40/x
  3. Step 3: Cross multiply
    390,061.40x = 585,111.30 × 203,437.40
  4. Step 4: Simplify right side
    390,061.40x = 119,033,521,582.62
  5. Step 5: Solve for x
    x = 119,033,521,582.62/390,061.40
  6. Step 6: Final answer
    x = 305,166.11

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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.