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Finding the Fourth Proportional to 15,620.90, 21,557 and 8,547.16

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Solution

The fourth proportional to 15,620.90, 21,557 and 8,547.16 is: 11,795.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,620.90 : 21,557 = 8,547.16 : x
  2. Step 2: Convert to fraction form
    15,620.90/21,557 = 8,547.16/x
  3. Step 3: Cross multiply
    15,620.90x = 21,557 × 8,547.16
  4. Step 4: Simplify right side
    15,620.90x = 184,251,128.12
  5. Step 5: Solve for x
    x = 184,251,128.12/15,620.90
  6. Step 6: Final answer
    x = 11,795.17

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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.