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Finding the Fourth Proportional to 642,830.40, 901,828.80 and 642,830.40

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Solution

The fourth proportional to 642,830.40, 901,828.80 and 642,830.40 is: 901,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,830.40 : 901,828.80 = 642,830.40 : x
  2. Step 2: Convert to fraction form
    642,830.40/901,828.80 = 642,830.40/x
  3. Step 3: Cross multiply
    642,830.40x = 901,828.80 × 642,830.40
  4. Step 4: Simplify right side
    642,830.40x = 579,722,968,235.52
  5. Step 5: Solve for x
    x = 579,722,968,235.52/642,830.40
  6. Step 6: Final answer
    x = 901,828.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.