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Finding the Fourth Proportional to 391,090.10, 539,712.00 and 255,210.98

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Solution

The fourth proportional to 391,090.10, 539,712.00 and 255,210.98 is: 352,196.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,090.10 : 539,712.00 = 255,210.98 : x
  2. Step 2: Convert to fraction form
    391,090.10/539,712.00 = 255,210.98/x
  3. Step 3: Cross multiply
    391,090.10x = 539,712.00 × 255,210.98
  4. Step 4: Simplify right side
    391,090.10x = 137,740,424,463.15
  5. Step 5: Solve for x
    x = 137,740,424,463.15/391,090.10
  6. Step 6: Final answer
    x = 352,196.15

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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.