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Finding the Fourth Proportional to 390,890.40, 586,335.60 and 204,266.40

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Solution

The fourth proportional to 390,890.40, 586,335.60 and 204,266.40 is: 306,399.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,890.40 : 586,335.60 = 204,266.40 : x
  2. Step 2: Convert to fraction form
    390,890.40/586,335.60 = 204,266.40/x
  3. Step 3: Cross multiply
    390,890.40x = 586,335.60 × 204,266.40
  4. Step 4: Simplify right side
    390,890.40x = 119,768,662,203.84
  5. Step 5: Solve for x
    x = 119,768,662,203.84/390,890.40
  6. Step 6: Final answer
    x = 306,399.60

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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.