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Finding the Fourth Proportional to 390,630.31, 586,001.60 and 120,779.50

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Solution

The fourth proportional to 390,630.31, 586,001.60 and 120,779.50 is: 181,186.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,630.31 : 586,001.60 = 120,779.50 : x
  2. Step 2: Convert to fraction form
    390,630.31/586,001.60 = 120,779.50/x
  3. Step 3: Cross multiply
    390,630.31x = 586,001.60 × 120,779.50
  4. Step 4: Simplify right side
    390,630.31x = 70,776,981,281.65
  5. Step 5: Solve for x
    x = 70,776,981,281.65/390,630.31
  6. Step 6: Final answer
    x = 181,186.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.