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Finding the Fourth Proportional to 209,987.80, 314,981.70 and 69,746.43

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Solution

The fourth proportional to 209,987.80, 314,981.70 and 69,746.43 is: 104,619.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,987.80 : 314,981.70 = 69,746.43 : x
  2. Step 2: Convert to fraction form
    209,987.80/314,981.70 = 69,746.43/x
  3. Step 3: Cross multiply
    209,987.80x = 314,981.70 × 69,746.43
  4. Step 4: Simplify right side
    209,987.80x = 21,968,849,090.33
  5. Step 5: Solve for x
    x = 21,968,849,090.33/209,987.80
  6. Step 6: Final answer
    x = 104,619.65

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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.