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Finding the Fourth Proportional to 645,697.32, 891,070.37 and 355,342.29

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Solution

The fourth proportional to 645,697.32, 891,070.37 and 355,342.29 is: 490,376.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,697.32 : 891,070.37 = 355,342.29 : x
  2. Step 2: Convert to fraction form
    645,697.32/891,070.37 = 355,342.29/x
  3. Step 3: Cross multiply
    645,697.32x = 891,070.37 × 355,342.29
  4. Step 4: Simplify right side
    645,697.32x = 316,634,985,826.95
  5. Step 5: Solve for x
    x = 316,634,985,826.95/645,697.32
  6. Step 6: Final answer
    x = 490,376.80

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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.