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Finding the Fourth Proportional to 408,859.90, 609,094.06 and 390,415.76

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Solution

The fourth proportional to 408,859.90, 609,094.06 and 390,415.76 is: 581,617.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,859.90 : 609,094.06 = 390,415.76 : x
  2. Step 2: Convert to fraction form
    408,859.90/609,094.06 = 390,415.76/x
  3. Step 3: Cross multiply
    408,859.90x = 609,094.06 × 390,415.76
  4. Step 4: Simplify right side
    408,859.90x = 237,799,920,346.39
  5. Step 5: Solve for x
    x = 237,799,920,346.39/408,859.90
  6. Step 6: Final answer
    x = 581,617.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.