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Finding the Fourth Proportional to 390,902.89, 539,447.03 and 212,054.89

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Solution

The fourth proportional to 390,902.89, 539,447.03 and 212,054.89 is: 292,636.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,902.89 : 539,447.03 = 212,054.89 : x
  2. Step 2: Convert to fraction form
    390,902.89/539,447.03 = 212,054.89/x
  3. Step 3: Cross multiply
    390,902.89x = 539,447.03 × 212,054.89
  4. Step 4: Simplify right side
    390,902.89x = 114,392,379,547.20
  5. Step 5: Solve for x
    x = 114,392,379,547.20/390,902.89
  6. Step 6: Final answer
    x = 292,636.31

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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.