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Finding the Fourth Proportional to 642,078.50, 886,071.29 and 355,592.58

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Solution

The fourth proportional to 642,078.50, 886,071.29 and 355,592.58 is: 490,719.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,078.50 : 886,071.29 = 355,592.58 : x
  2. Step 2: Convert to fraction form
    642,078.50/886,071.29 = 355,592.58/x
  3. Step 3: Cross multiply
    642,078.50x = 886,071.29 × 355,592.58
  4. Step 4: Simplify right side
    642,078.50x = 315,080,376,075.03
  5. Step 5: Solve for x
    x = 315,080,376,075.03/642,078.50
  6. Step 6: Final answer
    x = 490,719.40

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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.