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Finding the Fourth Proportional to 666,409.46, 919,352.88 and 390,627.47

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Solution

The fourth proportional to 666,409.46, 919,352.88 and 390,627.47 is: 538,894.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,409.46 : 919,352.88 = 390,627.47 : x
  2. Step 2: Convert to fraction form
    666,409.46/919,352.88 = 390,627.47/x
  3. Step 3: Cross multiply
    666,409.46x = 919,352.88 × 390,627.47
  4. Step 4: Simplify right side
    666,409.46x = 359,124,484,954.85
  5. Step 5: Solve for x
    x = 359,124,484,954.85/666,409.46
  6. Step 6: Final answer
    x = 538,894.64

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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.