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Finding the Fourth Proportional to 391,075.65, 539,405.55 and 358,913.91

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Solution

The fourth proportional to 391,075.65, 539,405.55 and 358,913.91 is: 495,045.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,075.65 : 539,405.55 = 358,913.91 : x
  2. Step 2: Convert to fraction form
    391,075.65/539,405.55 = 358,913.91/x
  3. Step 3: Cross multiply
    391,075.65x = 539,405.55 × 358,913.91
  4. Step 4: Simplify right side
    391,075.65x = 193,600,155,026.20
  5. Step 5: Solve for x
    x = 193,600,155,026.20/391,075.65
  6. Step 6: Final answer
    x = 495,045.28

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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.