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Finding the Fourth Proportional to 405,079.80, 607,619.70 and 138,842.93

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Solution

The fourth proportional to 405,079.80, 607,619.70 and 138,842.93 is: 208,264.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,079.80 : 607,619.70 = 138,842.93 : x
  2. Step 2: Convert to fraction form
    405,079.80/607,619.70 = 138,842.93/x
  3. Step 3: Cross multiply
    405,079.80x = 607,619.70 × 138,842.93
  4. Step 4: Simplify right side
    405,079.80x = 84,363,699,473.72
  5. Step 5: Solve for x
    x = 84,363,699,473.72/405,079.80
  6. Step 6: Final answer
    x = 208,264.40

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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.