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Finding the Fourth Proportional to 639,360.76, 882,316 and 352,878.80

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Solution

The fourth proportional to 639,360.76, 882,316 and 352,878.80 is: 486,971.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,360.76 : 882,316 = 352,878.80 : x
  2. Step 2: Convert to fraction form
    639,360.76/882,316 = 352,878.80/x
  3. Step 3: Cross multiply
    639,360.76x = 882,316 × 352,878.80
  4. Step 4: Simplify right side
    639,360.76x = 311,350,611,300.80
  5. Step 5: Solve for x
    x = 311,350,611,300.80/639,360.76
  6. Step 6: Final answer
    x = 486,971.72

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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.