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Finding the Fourth Proportional to 210,812.95, 290,928.81 and 115,317.46

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Solution

The fourth proportional to 210,812.95, 290,928.81 and 115,317.46 is: 159,141.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,812.95 : 290,928.81 = 115,317.46 : x
  2. Step 2: Convert to fraction form
    210,812.95/290,928.81 = 115,317.46/x
  3. Step 3: Cross multiply
    210,812.95x = 290,928.81 × 115,317.46
  4. Step 4: Simplify right side
    210,812.95x = 33,549,171,410.02
  5. Step 5: Solve for x
    x = 33,549,171,410.02/210,812.95
  6. Step 6: Final answer
    x = 159,141.89

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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.