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Finding the Fourth Proportional to 210,456.10, 315,681.99 and 121,653.10

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Solution

The fourth proportional to 210,456.10, 315,681.99 and 121,653.10 is: 182,478.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,456.10 : 315,681.99 = 121,653.10 : x
  2. Step 2: Convert to fraction form
    210,456.10/315,681.99 = 121,653.10/x
  3. Step 3: Cross multiply
    210,456.10x = 315,681.99 × 121,653.10
  4. Step 4: Simplify right side
    210,456.10x = 38,403,692,697.67
  5. Step 5: Solve for x
    x = 38,403,692,697.67/210,456.10
  6. Step 6: Final answer
    x = 182,478.40

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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.