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Finding the Fourth Proportional to 666,746.21, 920,115.55 and 391,268.96

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Solution

The fourth proportional to 666,746.21, 920,115.55 and 391,268.96 is: 539,954.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,746.21 : 920,115.55 = 391,268.96 : x
  2. Step 2: Convert to fraction form
    666,746.21/920,115.55 = 391,268.96/x
  3. Step 3: Cross multiply
    666,746.21x = 920,115.55 × 391,268.96
  4. Step 4: Simplify right side
    666,746.21x = 360,012,651,079.45
  5. Step 5: Solve for x
    x = 360,012,651,079.45/666,746.21
  6. Step 6: Final answer
    x = 539,954.55

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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.