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Finding the Fourth Proportional to 386,310.60, 579,465.90 and 260,339.40

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Solution

The fourth proportional to 386,310.60, 579,465.90 and 260,339.40 is: 390,509.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,310.60 : 579,465.90 = 260,339.40 : x
  2. Step 2: Convert to fraction form
    386,310.60/579,465.90 = 260,339.40/x
  3. Step 3: Cross multiply
    386,310.60x = 579,465.90 × 260,339.40
  4. Step 4: Simplify right side
    386,310.60x = 150,857,804,726.46
  5. Step 5: Solve for x
    x = 150,857,804,726.46/386,310.60
  6. Step 6: Final answer
    x = 390,509.10

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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.