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Finding the Fourth Proportional to 210,699.81, 315,746.55 and 90,723.81

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Solution

The fourth proportional to 210,699.81, 315,746.55 and 90,723.81 is: 135,955.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,699.81 : 315,746.55 = 90,723.81 : x
  2. Step 2: Convert to fraction form
    210,699.81/315,746.55 = 90,723.81/x
  3. Step 3: Cross multiply
    210,699.81x = 315,746.55 × 90,723.81
  4. Step 4: Simplify right side
    210,699.81x = 28,645,730,010.36
  5. Step 5: Solve for x
    x = 28,645,730,010.36/210,699.81
  6. Step 6: Final answer
    x = 135,955.18

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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.