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Finding the Fourth Proportional to 210,539.91, 315,815.63 and 70,293.51

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Solution

The fourth proportional to 210,539.91, 315,815.63 and 70,293.51 is: 105,442.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,539.91 : 315,815.63 = 70,293.51 : x
  2. Step 2: Convert to fraction form
    210,539.91/315,815.63 = 70,293.51/x
  3. Step 3: Cross multiply
    210,539.91x = 315,815.63 × 70,293.51
  4. Step 4: Simplify right side
    210,539.91x = 22,199,788,794.09
  5. Step 5: Solve for x
    x = 22,199,788,794.09/210,539.91
  6. Step 6: Final answer
    x = 105,442.19

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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.