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Finding the Fourth Proportional to 661,982.76, 913,723.74 and 390,208.32

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Solution

The fourth proportional to 661,982.76, 913,723.74 and 390,208.32 is: 538,598.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,982.76 : 913,723.74 = 390,208.32 : x
  2. Step 2: Convert to fraction form
    661,982.76/913,723.74 = 390,208.32/x
  3. Step 3: Cross multiply
    661,982.76x = 913,723.74 × 390,208.32
  4. Step 4: Simplify right side
    661,982.76x = 356,542,605,529.52
  5. Step 5: Solve for x
    x = 356,542,605,529.52/661,982.76
  6. Step 6: Final answer
    x = 538,598.02

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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.