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Finding the Fourth Proportional to 390,453.61, 585,011.16 and 262,129.54

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Solution

The fourth proportional to 390,453.61, 585,011.16 and 262,129.54 is: 392,745.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,453.61 : 585,011.16 = 262,129.54 : x
  2. Step 2: Convert to fraction form
    390,453.61/585,011.16 = 262,129.54/x
  3. Step 3: Cross multiply
    390,453.61x = 585,011.16 × 262,129.54
  4. Step 4: Simplify right side
    390,453.61x = 153,348,706,265.67
  5. Step 5: Solve for x
    x = 153,348,706,265.67/390,453.61
  6. Step 6: Final answer
    x = 392,745.01

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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.