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Finding the Fourth Proportional to 121,312.10, 181,968.15 and 111,980.90

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Solution

The fourth proportional to 121,312.10, 181,968.15 and 111,980.90 is: 167,971.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,312.10 : 181,968.15 = 111,980.90 : x
  2. Step 2: Convert to fraction form
    121,312.10/181,968.15 = 111,980.90/x
  3. Step 3: Cross multiply
    121,312.10x = 181,968.15 × 111,980.90
  4. Step 4: Simplify right side
    121,312.10x = 20,376,957,208.34
  5. Step 5: Solve for x
    x = 20,376,957,208.34/121,312.10
  6. Step 6: Final answer
    x = 167,971.35

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1.5x scale

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.