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Finding the Fourth Proportional to 409,256.90, 613,885.35 and 390,886.10

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Solution

The fourth proportional to 409,256.90, 613,885.35 and 390,886.10 is: 586,329.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,256.90 : 613,885.35 = 390,886.10 : x
  2. Step 2: Convert to fraction form
    409,256.90/613,885.35 = 390,886.10/x
  3. Step 3: Cross multiply
    409,256.90x = 613,885.35 × 390,886.10
  4. Step 4: Simplify right side
    409,256.90x = 239,959,250,308.64
  5. Step 5: Solve for x
    x = 239,959,250,308.64/409,256.90
  6. Step 6: Final answer
    x = 586,329.15

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Similar ratio
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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.