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Finding the Fourth Proportional to 390,557.87, 538,944.42 and 218,446.01

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Solution

The fourth proportional to 390,557.87, 538,944.42 and 218,446.01 is: 301,441.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,557.87 : 538,944.42 = 218,446.01 : x
  2. Step 2: Convert to fraction form
    390,557.87/538,944.42 = 218,446.01/x
  3. Step 3: Cross multiply
    390,557.87x = 538,944.42 × 218,446.01
  4. Step 4: Simplify right side
    390,557.87x = 117,730,255,466.04
  5. Step 5: Solve for x
    x = 117,730,255,466.04/390,557.87
  6. Step 6: Final answer
    x = 301,441.26

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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.