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Finding the Fourth Proportional to 390,492.47, 538,720.62 and 254,476.87

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Solution

The fourth proportional to 390,492.47, 538,720.62 and 254,476.87 is: 351,074.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,492.47 : 538,720.62 = 254,476.87 : x
  2. Step 2: Convert to fraction form
    390,492.47/538,720.62 = 254,476.87/x
  3. Step 3: Cross multiply
    390,492.47x = 538,720.62 × 254,476.87
  4. Step 4: Simplify right side
    390,492.47x = 137,091,937,182.06
  5. Step 5: Solve for x
    x = 137,091,937,182.06/390,492.47
  6. Step 6: Final answer
    x = 351,074.47

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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.