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Finding the Fourth Proportional to 390,940.61, 539,219.86 and 358,779.11

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Solution

The fourth proportional to 390,940.61, 539,219.86 and 358,779.11 is: 494,859.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,940.61 : 539,219.86 = 358,779.11 : x
  2. Step 2: Convert to fraction form
    390,940.61/539,219.86 = 358,779.11/x
  3. Step 3: Cross multiply
    390,940.61x = 539,219.86 × 358,779.11
  4. Step 4: Simplify right side
    390,940.61x = 193,460,820,004.30
  5. Step 5: Solve for x
    x = 193,460,820,004.30/390,940.61
  6. Step 6: Final answer
    x = 494,859.87

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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.