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Finding the Fourth Proportional to 665,014.79, 917,721.47 and 378,534.89

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Solution

The fourth proportional to 665,014.79, 917,721.47 and 378,534.89 is: 522,378.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,014.79 : 917,721.47 = 378,534.89 : x
  2. Step 2: Convert to fraction form
    665,014.79/917,721.47 = 378,534.89/x
  3. Step 3: Cross multiply
    665,014.79x = 917,721.47 × 378,534.89
  4. Step 4: Simplify right side
    665,014.79x = 347,389,598,937.73
  5. Step 5: Solve for x
    x = 347,389,598,937.73/665,014.79
  6. Step 6: Final answer
    x = 522,378.75

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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.