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Finding the Fourth Proportional to 390,818.16, 539,290.95 and 218,725.88

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Solution

The fourth proportional to 390,818.16, 539,290.95 and 218,725.88 is: 301,820.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,818.16 : 539,290.95 = 218,725.88 : x
  2. Step 2: Convert to fraction form
    390,818.16/539,290.95 = 218,725.88/x
  3. Step 3: Cross multiply
    390,818.16x = 539,290.95 × 218,725.88
  4. Step 4: Simplify right side
    390,818.16x = 117,956,884,918.33
  5. Step 5: Solve for x
    x = 117,956,884,918.33/390,818.16
  6. Step 6: Final answer
    x = 301,820.38

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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.