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Finding the Fourth Proportional to 319,513.20, 478,686.60 and 260,026.80

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Solution

The fourth proportional to 319,513.20, 478,686.60 and 260,026.80 is: 389,565.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,513.20 : 478,686.60 = 260,026.80 : x
  2. Step 2: Convert to fraction form
    319,513.20/478,686.60 = 260,026.80/x
  3. Step 3: Cross multiply
    319,513.20x = 478,686.60 × 260,026.80
  4. Step 4: Simplify right side
    319,513.20x = 124,471,344,800.88
  5. Step 5: Solve for x
    x = 124,471,344,800.88/319,513.20
  6. Step 6: Final answer
    x = 389,565.58

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1.5x scale

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.