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Finding the Fourth Proportional to 688,122, 949,611.60 and 386,316

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Solution

The fourth proportional to 688,122, 949,611.60 and 386,316 is: 533,117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,122 : 949,611.60 = 386,316 : x
  2. Step 2: Convert to fraction form
    688,122/949,611.60 = 386,316/x
  3. Step 3: Cross multiply
    688,122x = 949,611.60 × 386,316
  4. Step 4: Simplify right side
    688,122x = 366,850,154,865.60
  5. Step 5: Solve for x
    x = 366,850,154,865.60/688,122
  6. Step 6: Final answer
    x = 533,117.90

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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.