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Finding the Fourth Proportional to 210,510.30, 315,765.45 and 121,718.10

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Solution

The fourth proportional to 210,510.30, 315,765.45 and 121,718.10 is: 182,577.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,510.30 : 315,765.45 = 121,718.10 : x
  2. Step 2: Convert to fraction form
    210,510.30/315,765.45 = 121,718.10/x
  3. Step 3: Cross multiply
    210,510.30x = 315,765.45 × 121,718.10
  4. Step 4: Simplify right side
    210,510.30x = 38,434,370,619.65
  5. Step 5: Solve for x
    x = 38,434,370,619.65/210,510.30
  6. Step 6: Final answer
    x = 182,577.15

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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.