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Finding the Fourth Proportional to 390,411.40, 584,321.10 and 283,491.40

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Solution

The fourth proportional to 390,411.40, 584,321.10 and 283,491.40 is: 424,296.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,411.40 : 584,321.10 = 283,491.40 : x
  2. Step 2: Convert to fraction form
    390,411.40/584,321.10 = 283,491.40/x
  3. Step 3: Cross multiply
    390,411.40x = 584,321.10 × 283,491.40
  4. Step 4: Simplify right side
    390,411.40x = 165,650,006,688.54
  5. Step 5: Solve for x
    x = 165,650,006,688.54/390,411.40
  6. Step 6: Final answer
    x = 424,296.03

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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.