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Finding the Fourth Proportional to 15,807.79, 21,816.84 and 15,288.53

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Solution

The fourth proportional to 15,807.79, 21,816.84 and 15,288.53 is: 21,100.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,807.79 : 21,816.84 = 15,288.53 : x
  2. Step 2: Convert to fraction form
    15,807.79/21,816.84 = 15,288.53/x
  3. Step 3: Cross multiply
    15,807.79x = 21,816.84 × 15,288.53
  4. Step 4: Simplify right side
    15,807.79x = 333,547,412.85
  5. Step 5: Solve for x
    x = 333,547,412.85/15,807.79
  6. Step 6: Final answer
    x = 21,100.19

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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.