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Finding the Fourth Proportional to 688,129, 949,621.26 and 386,323

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Solution

The fourth proportional to 688,129, 949,621.26 and 386,323 is: 533,127.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,129 : 949,621.26 = 386,323 : x
  2. Step 2: Convert to fraction form
    688,129/949,621.26 = 386,323/x
  3. Step 3: Cross multiply
    688,129x = 949,621.26 × 386,323
  4. Step 4: Simplify right side
    688,129x = 366,860,534,026.98
  5. Step 5: Solve for x
    x = 366,860,534,026.98/688,129
  6. Step 6: Final answer
    x = 533,127.56

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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.