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Finding the Fourth Proportional to 390,971.34, 539,380.08 and 237,886.81

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Solution

The fourth proportional to 390,971.34, 539,380.08 and 237,886.81 is: 328,186.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,971.34 : 539,380.08 = 237,886.81 : x
  2. Step 2: Convert to fraction form
    390,971.34/539,380.08 = 237,886.81/x
  3. Step 3: Cross multiply
    390,971.34x = 539,380.08 × 237,886.81
  4. Step 4: Simplify right side
    390,971.34x = 128,311,405,260.30
  5. Step 5: Solve for x
    x = 128,311,405,260.30/390,971.34
  6. Step 6: Final answer
    x = 328,186.22

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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.