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Finding the Fourth Proportional to 391,071.42, 539,678.52 and 212,223.42

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Solution

The fourth proportional to 391,071.42, 539,678.52 and 212,223.42 is: 292,868.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,071.42 : 539,678.52 = 212,223.42 : x
  2. Step 2: Convert to fraction form
    391,071.42/539,678.52 = 212,223.42/x
  3. Step 3: Cross multiply
    391,071.42x = 539,678.52 × 212,223.42
  4. Step 4: Simplify right side
    391,071.42x = 114,532,421,214.94
  5. Step 5: Solve for x
    x = 114,532,421,214.94/391,071.42
  6. Step 6: Final answer
    x = 292,868.30

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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.