Home / 390,944.64-539,554.32-218,928.12

Finding the Fourth Proportional to 390,944.64, 539,554.32 and 218,928.12

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Solution

The fourth proportional to 390,944.64, 539,554.32 and 218,928.12 is: 302,149.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,944.64 : 539,554.32 = 218,928.12 : x
  2. Step 2: Convert to fraction form
    390,944.64/539,554.32 = 218,928.12/x
  3. Step 3: Cross multiply
    390,944.64x = 539,554.32 × 218,928.12
  4. Step 4: Simplify right side
    390,944.64x = 118,123,612,915.48
  5. Step 5: Solve for x
    x = 118,123,612,915.48/390,944.64
  6. Step 6: Final answer
    x = 302,149.21

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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.