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Finding the Fourth Proportional to 210,887.15, 316,331.93 and 86,228.15

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Solution

The fourth proportional to 210,887.15, 316,331.93 and 86,228.15 is: 129,342.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,887.15 : 316,331.93 = 86,228.15 : x
  2. Step 2: Convert to fraction form
    210,887.15/316,331.93 = 86,228.15/x
  3. Step 3: Cross multiply
    210,887.15x = 316,331.93 × 86,228.15
  4. Step 4: Simplify right side
    210,887.15x = 27,276,716,678.69
  5. Step 5: Solve for x
    x = 27,276,716,678.69/210,887.15
  6. Step 6: Final answer
    x = 129,342.72

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1.5x scale

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.