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Finding the Fourth Proportional to 211,123.40, 316,416.30 and 86,323.40

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Solution

The fourth proportional to 211,123.40, 316,416.30 and 86,323.40 is: 129,375.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,123.40 : 316,416.30 = 86,323.40 : x
  2. Step 2: Convert to fraction form
    211,123.40/316,416.30 = 86,323.40/x
  3. Step 3: Cross multiply
    211,123.40x = 316,416.30 × 86,323.40
  4. Step 4: Simplify right side
    211,123.40x = 27,314,130,831.42
  5. Step 5: Solve for x
    x = 27,314,130,831.42/211,123.40
  6. Step 6: Final answer
    x = 129,375.19

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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.