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Finding the Fourth Proportional to 646,256.60, 891,703.80 and 391,459.76

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Solution

The fourth proportional to 646,256.60, 891,703.80 and 391,459.76 is: 540,135.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,256.60 : 891,703.80 = 391,459.76 : x
  2. Step 2: Convert to fraction form
    646,256.60/891,703.80 = 391,459.76/x
  3. Step 3: Cross multiply
    646,256.60x = 891,703.80 × 391,459.76
  4. Step 4: Simplify right side
    646,256.60x = 349,066,155,539.09
  5. Step 5: Solve for x
    x = 349,066,155,539.09/646,256.60
  6. Step 6: Final answer
    x = 540,135.54

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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.