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Finding the Fourth Proportional to 389,686.40, 537,774.40 and 219,887.76

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Solution

The fourth proportional to 389,686.40, 537,774.40 and 219,887.76 is: 303,449.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,686.40 : 537,774.40 = 219,887.76 : x
  2. Step 2: Convert to fraction form
    389,686.40/537,774.40 = 219,887.76/x
  3. Step 3: Cross multiply
    389,686.40x = 537,774.40 × 219,887.76
  4. Step 4: Simplify right side
    389,686.40x = 118,250,008,201.34
  5. Step 5: Solve for x
    x = 118,250,008,201.34/389,686.40
  6. Step 6: Final answer
    x = 303,449.15

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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.