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Finding the Fourth Proportional to 391,354.42, 539,830.39 and 258,746.77

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Solution

The fourth proportional to 391,354.42, 539,830.39 and 258,746.77 is: 356,912.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,354.42 : 539,830.39 = 258,746.77 : x
  2. Step 2: Convert to fraction form
    391,354.42/539,830.39 = 258,746.77/x
  3. Step 3: Cross multiply
    391,354.42x = 539,830.39 × 258,746.77
  4. Step 4: Simplify right side
    391,354.42x = 139,679,370,273.41
  5. Step 5: Solve for x
    x = 139,679,370,273.41/391,354.42
  6. Step 6: Final answer
    x = 356,912.72

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1.5x scale

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.