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Finding the Fourth Proportional to 431,095.40, 646,643.10 and 399,991.40

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Solution

The fourth proportional to 431,095.40, 646,643.10 and 399,991.40 is: 599,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,095.40 : 646,643.10 = 399,991.40 : x
  2. Step 2: Convert to fraction form
    431,095.40/646,643.10 = 399,991.40/x
  3. Step 3: Cross multiply
    431,095.40x = 646,643.10 × 399,991.40
  4. Step 4: Simplify right side
    431,095.40x = 258,651,678,869.34
  5. Step 5: Solve for x
    x = 258,651,678,869.34/431,095.40
  6. Step 6: Final answer
    x = 599,987.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.