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Finding the Fourth Proportional to 691,870.56, 954,782.64 and 390,063.84

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Solution

The fourth proportional to 691,870.56, 954,782.64 and 390,063.84 is: 538,288.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,870.56 : 954,782.64 = 390,063.84 : x
  2. Step 2: Convert to fraction form
    691,870.56/954,782.64 = 390,063.84/x
  3. Step 3: Cross multiply
    691,870.56x = 954,782.64 × 390,063.84
  4. Step 4: Simplify right side
    691,870.56x = 372,426,182,923.74
  5. Step 5: Solve for x
    x = 372,426,182,923.74/691,870.56
  6. Step 6: Final answer
    x = 538,288.81

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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.