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Finding the Fourth Proportional to 390,898.89, 539,441.51 and 212,050.89

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Solution

The fourth proportional to 390,898.89, 539,441.51 and 212,050.89 is: 292,630.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,898.89 : 539,441.51 = 212,050.89 : x
  2. Step 2: Convert to fraction form
    390,898.89/539,441.51 = 212,050.89/x
  3. Step 3: Cross multiply
    390,898.89x = 539,441.51 × 212,050.89
  4. Step 4: Simplify right side
    390,898.89x = 114,389,051,238.19
  5. Step 5: Solve for x
    x = 114,389,051,238.19/390,898.89
  6. Step 6: Final answer
    x = 292,630.79

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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.