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Finding the Fourth Proportional to 721,657.34, 995,889.72 and 390,513.26

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Solution

The fourth proportional to 721,657.34, 995,889.72 and 390,513.26 is: 538,909.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,657.34 : 995,889.72 = 390,513.26 : x
  2. Step 2: Convert to fraction form
    721,657.34/995,889.72 = 390,513.26/x
  3. Step 3: Cross multiply
    721,657.34x = 995,889.72 × 390,513.26
  4. Step 4: Simplify right side
    721,657.34x = 388,908,141,157.69
  5. Step 5: Solve for x
    x = 388,908,141,157.69/721,657.34
  6. Step 6: Final answer
    x = 538,909.70

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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.