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Finding the Fourth Proportional to 153,415.50, 211,716.63 and 86,347.50

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Solution

The fourth proportional to 153,415.50, 211,716.63 and 86,347.50 is: 119,161.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,415.50 : 211,716.63 = 86,347.50 : x
  2. Step 2: Convert to fraction form
    153,415.50/211,716.63 = 86,347.50/x
  3. Step 3: Cross multiply
    153,415.50x = 211,716.63 × 86,347.50
  4. Step 4: Simplify right side
    153,415.50x = 18,281,201,708.93
  5. Step 5: Solve for x
    x = 18,281,201,708.93/153,415.50
  6. Step 6: Final answer
    x = 119,161.37

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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.