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Finding the Fourth Proportional to 645,695.82, 891,068.29 and 355,340.79

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Solution

The fourth proportional to 645,695.82, 891,068.29 and 355,340.79 is: 490,374.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,695.82 : 891,068.29 = 355,340.79 : x
  2. Step 2: Convert to fraction form
    645,695.82/891,068.29 = 355,340.79/x
  3. Step 3: Cross multiply
    645,695.82x = 891,068.29 × 355,340.79
  4. Step 4: Simplify right side
    645,695.82x = 316,632,911,222.99
  5. Step 5: Solve for x
    x = 316,632,911,222.99/645,695.82
  6. Step 6: Final answer
    x = 490,374.73

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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.