Home / 645,146.56-890,139.54-390,448.54

Finding the Fourth Proportional to 645,146.56, 890,139.54 and 390,448.54

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Solution

The fourth proportional to 645,146.56, 890,139.54 and 390,448.54 is: 538,720.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,146.56 : 890,139.54 = 390,448.54 : x
  2. Step 2: Convert to fraction form
    645,146.56/890,139.54 = 390,448.54/x
  3. Step 3: Cross multiply
    645,146.56x = 890,139.54 × 390,448.54
  4. Step 4: Simplify right side
    645,146.56x = 347,553,683,789.27
  5. Step 5: Solve for x
    x = 347,553,683,789.27/645,146.56
  6. Step 6: Final answer
    x = 538,720.51

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Double scale
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Similar ratio
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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.