Home / 15,678.90-21,636.23-8,605.49

Finding the Fourth Proportional to 15,678.90, 21,636.23 and 8,605.49

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Solution

The fourth proportional to 15,678.90, 21,636.23 and 8,605.49 is: 11,875.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.90 : 21,636.23 = 8,605.49 : x
  2. Step 2: Convert to fraction form
    15,678.90/21,636.23 = 8,605.49/x
  3. Step 3: Cross multiply
    15,678.90x = 21,636.23 × 8,605.49
  4. Step 4: Simplify right side
    15,678.90x = 186,190,209.69
  5. Step 5: Solve for x
    x = 186,190,209.69/15,678.90
  6. Step 6: Final answer
    x = 11,875.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.