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Finding the Fourth Proportional to 15,678.48, 21,636.48 and 8,605.68

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Solution

The fourth proportional to 15,678.48, 21,636.48 and 8,605.68 is: 11,875.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,678.48 : 21,636.48 = 8,605.68 : x
  2. Step 2: Convert to fraction form
    15,678.48/21,636.48 = 8,605.68/x
  3. Step 3: Cross multiply
    15,678.48x = 21,636.48 × 8,605.68
  4. Step 4: Simplify right side
    15,678.48x = 186,196,623.21
  5. Step 5: Solve for x
    x = 186,196,623.21/15,678.48
  6. Step 6: Final answer
    x = 11,875.94

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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.