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Finding the Fourth Proportional to 399,317.90, 551,641.64 and 345,509.51

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Solution

The fourth proportional to 399,317.90, 551,641.64 and 345,509.51 is: 477,307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,317.90 : 551,641.64 = 345,509.51 : x
  2. Step 2: Convert to fraction form
    399,317.90/551,641.64 = 345,509.51/x
  3. Step 3: Cross multiply
    399,317.90x = 551,641.64 × 345,509.51
  4. Step 4: Simplify right side
    399,317.90x = 190,597,428,246.24
  5. Step 5: Solve for x
    x = 190,597,428,246.24/399,317.90
  6. Step 6: Final answer
    x = 477,307.51

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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.