Home / 645,346.32-890,438.76-390,708.24

Finding the Fourth Proportional to 645,346.32, 890,438.76 and 390,708.24

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Solution

The fourth proportional to 645,346.32, 890,438.76 and 390,708.24 is: 539,093.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,346.32 : 890,438.76 = 390,708.24 : x
  2. Step 2: Convert to fraction form
    645,346.32/890,438.76 = 390,708.24/x
  3. Step 3: Cross multiply
    645,346.32x = 890,438.76 × 390,708.24
  4. Step 4: Simplify right side
    645,346.32x = 347,901,760,747.38
  5. Step 5: Solve for x
    x = 347,901,760,747.38/645,346.32
  6. Step 6: Final answer
    x = 539,093.12

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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.