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Finding the Fourth Proportional to 312,085.40, 468,128.10 and 292,402.40

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Solution

The fourth proportional to 312,085.40, 468,128.10 and 292,402.40 is: 438,603.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,085.40 : 468,128.10 = 292,402.40 : x
  2. Step 2: Convert to fraction form
    312,085.40/468,128.10 = 292,402.40/x
  3. Step 3: Cross multiply
    312,085.40x = 468,128.10 × 292,402.40
  4. Step 4: Simplify right side
    312,085.40x = 136,881,779,947.44
  5. Step 5: Solve for x
    x = 136,881,779,947.44/312,085.40
  6. Step 6: Final answer
    x = 438,603.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.