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Finding the Fourth Proportional to 390,503.84, 538,736.27 and 254,488.23

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Solution

The fourth proportional to 390,503.84, 538,736.27 and 254,488.23 is: 351,090.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,503.84 : 538,736.27 = 254,488.23 : x
  2. Step 2: Convert to fraction form
    390,503.84/538,736.27 = 254,488.23/x
  3. Step 3: Cross multiply
    390,503.84x = 538,736.27 × 254,488.23
  4. Step 4: Simplify right side
    390,503.84x = 137,102,038,516.66
  5. Step 5: Solve for x
    x = 137,102,038,516.66/390,503.84
  6. Step 6: Final answer
    x = 351,090.12

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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.