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Finding the Fourth Proportional to 391,055.45, 539,656.52 and 212,207.45

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Solution

The fourth proportional to 391,055.45, 539,656.52 and 212,207.45 is: 292,846.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,055.45 : 539,656.52 = 212,207.45 : x
  2. Step 2: Convert to fraction form
    391,055.45/539,656.52 = 212,207.45/x
  3. Step 3: Cross multiply
    391,055.45x = 539,656.52 × 212,207.45
  4. Step 4: Simplify right side
    391,055.45x = 114,519,130,225.75
  5. Step 5: Solve for x
    x = 114,519,130,225.75/391,055.45
  6. Step 6: Final answer
    x = 292,846.27

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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.